One his last evening home, what advice does Paul’s mother give him?

On Paul's last night, his mother gives him advice about how to handle the war that he finds both absurd and moving. She gives him two pairs of wool underpants that he knows cost her dearly.

"I would like to tell you to be on your guard against the women out in France. They are no good."

"And be very careful at the front, Paul."

"Perhaps you can get a job that is not so dangerous."